Thermal conductivity improvement of copper-carbon fiber composite by addition of an insulator: Calcium hydroxide

S. Couillaud, Y. F. Lu, J. F. Silvain

Research output: Contribution to conferencePaper

Abstract

The effects of adding calcium hydroxide (Ca(OH)2) to a copper-carbon fiber (30%) composite (Cu-CF(30%)) were studied. After sintering at 700 °C, precipitates of calcium oxide (CaO) were included in the copper matrix. When less than 10% of Ca(OH)2 was added, the thermal conductivity was similar to or higher than the reference composite Cu-CF(30%). A thermal conductivity of 322 W.m-1.K-1 was measured for the Cu-Ca(OH)2(3%)-CF(30%) composite. The effects of heat treatment (400 °C, 600 °C and 1000 °C during 24 hours) on the composite Cu-Ca(OH)2(3%)-CF(30%) were studied. At the lower annealing temperature, CaO inside the matrix migrated to the interface of the copper matrix and the carbon fiber. At 1000 °C, the formation of the interphase calcium carbide (CaC2) at the interface of the copper and carbon fibers was highlighted by TEM observations. Carbide formation at the interface led to a decrease in both thermal conductivity (around 270 W.m-1.K-1) and the coefficient of thermal expansion (CTE (10.1 10-6 K-1)).

Original languageEnglish (US)
Publication statusPublished - Jan 1 2015
Event20th International Conference on Composite Materials, ICCM 2015 - Copenhagen, Denmark
Duration: Jul 19 2015Jul 24 2015

Other

Other20th International Conference on Composite Materials, ICCM 2015
CountryDenmark
CityCopenhagen
Period7/19/157/24/15

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Keywords

  • Calcium hydroxide
  • Carbon fiber
  • Composite materials
  • Copper
  • Interphase
  • Thermal properties

ASJC Scopus subject areas

  • Engineering(all)
  • Ceramics and Composites

Cite this

Couillaud, S., Lu, Y. F., & Silvain, J. F. (2015). Thermal conductivity improvement of copper-carbon fiber composite by addition of an insulator: Calcium hydroxide. Paper presented at 20th International Conference on Composite Materials, ICCM 2015, Copenhagen, Denmark.